21423603960 has 192 divisors, whose sum is σ = 76131900000. Its totient is φ = 5181603840.

The previous prime is 21423603941. The next prime is 21423603977. The reversal of 21423603960 is 6930632412.

21423603960 is a `hidden beast` number, since 2 + 1 + 42 + 3 + 603 + 9 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1772016 + ... + 1784064.

Almost surely, 2^21423603960 is an apocalyptic number.

21423603960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21423603960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38065950000).

21423603960 is an abundant number, since it is smaller than the sum of its proper divisors (54708296040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21423603960 is a wasteful number, since it uses less digits than its factorization.

21423603960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12526 (or 12519 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The spelling of 21423603960 in words is "twenty-one billion, four hundred twenty-three million, six hundred three thousand, nine hundred sixty".